Aviation equipment high / intermediate frequency digital signal integrated long-distance transmission method

Abstract

The invention relates to the field of information communication, in particular to an aeronautical equipment high / intermediate frequency digital signal integrated remote transmission method, which comprises the following steps that a multi-layer embedded signal processing device is connected to an equipment signal output end, and the multi-layer embedded signal processing device comprises embedded software, a single chip microcomputer and an FPGA (Field Programmable Gate Array) connected with the single chip microcomputer; a parallel signal output by equipment is received through a first GPIO of the single-chip microcomputer, and a standard signal 1 corresponding to a communication protocol 2 is output from a standard interface 1 to far-end test equipment; and the FPGA receives the high / low-speed low-level differential signal output by the equipment, then decodes and frames the high / low-speed low-level differential signal, then transmits the decoded and framed signal to the second GPIO of the single-chip microcomputer, and outputs a standard signal 2 corresponding to a communication protocol 3 from a standard interface 2 to far-end test equipment. The problem that reliable transmission cannot be achieved due to characteristic decay and disturbance of equipment sending signals caused by factors such as long-line transmission and complex electromagnetic environment is solved.

Description

Technical Field

[0001] The present invention relates to the field of information communication, and in particular to a signal transmission technology for aviation equipment during simulation testing, and specifically to an integrated long-distance transmission method for high / medium frequency digital signals of aviation equipment. Background Art

[0002] When aviation equipment is undergoing simulation testing, the equipment is fixed in a microwave darkroom and the signal is generated from the equipment end. If the equipment signal is directly collected and processed in the darkroom, it will not only have a safety impact on personnel and equipment, but also damage the electromagnetic environment in the darkroom, affecting the equipment test. It is necessary to use certain methods to effectively transmit the various high / medium frequency digital signals generated by the equipment in a complex electromagnetic environment to the remote data acquisition device.

[0003] However, the test signals that the equipment needs to send include parallel intermediate frequency bus signals and high-frequency low-level differential bus signals. The effective transmission distance of these signals is less than 5 meters. When the signals are transmitted over a long distance of more than 40 meters, the signal attenuation is obvious and cannot meet the remote testing requirements. In addition, under the interference of signals such as high-power motors and RF antennas in the darkroom, the characteristics of the signal are obviously interfered with, making it impossible to collect and interpret the equipment signals. In addition, in complex electromagnetic environments, when performing equipment simulation tests, the signal acquisition system still has the problem of being scattered and bloated. Summary of the invention

[0004] In response to the problems pointed out in the background technology, the purpose of the present invention is to provide an integrated long-distance transmission method for high / medium frequency digital signals of aviation equipment, which can effectively solve the problem of distortion of multiple signals in long-distance transmission under complex electromagnetic interference environment. It can not only realize the remote deployment of equipment acquisition system and ensure the safety of personnel and equipment, but also ensure the quality of signal transmission and ensure the implementation of equipment simulation testing.

[0005] To achieve the above object, the present invention adopts the following technical solutions: An integrated long-distance transmission method for high / medium frequency digital signals of aviation equipment, comprising: connecting a multi-layer embedded signal processing device to the signal output end of the equipment, the multi-layer embedded signal processing device comprising embedded software, a single-chip microcomputer and an FPGA connected to the single-chip microcomputer; When the device outputs parallel signals and high / medium frequency digital signals at the same time, The parallel signal output by the equipment is received through the first GPIO of the single-chip microcomputer. The embedded software logically decodes the parallel signal according to the timing. After receiving the complete data frame, the signal is modulated and encoded according to the communication protocol 2, and the standard signal 1 corresponding to the communication protocol 2 is output from the standard interface 1 to the remote test equipment; the standard signal 1 is a bus signal with strong anti-interference ability and suitable for long-distance transmission; The FPGA receives the high / low-speed low-level differential signal output by the equipment, decodes and frames it, and then passes the decoded and framed signal to the second GPIO of the microcontroller. The embedded software logically decodes the modulated signal according to the timing. After receiving the complete data frame, it modulates and frames the signal according to the communication protocol 3, and outputs the standard signal 2 corresponding to the communication protocol 3 from the standard interface 2 to the remote test equipment; the standard signal 2 is a bus signal or Ethernet signal with strong anti-interference ability and suitable for long-distance transmission.

[0006] The single chip microcomputer receives the parallel signal output by the equipment according to the communication protocol 1, and the communication protocol 1 is specifically as follows: a) Timing signal 1 = 0, timing signal 2 = 1, read the parallel signal address, and divide all equipment signal data into several packets; b) Timing signal 1 = 1, timing signal 2 = 0, read the parallel signal data and store it as the low data bit of the data; c) Timing signal 1 = 1, timing signal 2 = 1, read the parallel signal data and store it as the high data bit of the data.

[0007] The communication protocol 2 is specifically as follows: When the data states of the received equipment signal are X1, X2, X3 and X4 respectively, the received data is framed according to the data frame header, counter, data, and data accumulation, and then sent; X1 indicates that the data is 0, X2 indicates the data size limit, X3 indicates the low data bit of the data, and X4 indicates the high data bit of the data.

[0008] The standard signal 2 is an RS485 bus signal.

[0009] The communication protocol 3 is as follows: a) Set the baud rate to 10MHz; b) completing data framing according to frame counter, data bit, data bit accumulation and data bit accumulation; c) Set the data sending period to 24ms.

[0010] The standard signal 2 is an RS485 bus signal.

[0011] The single chip microcomputer is an STM32 single chip microcomputer.

[0012] The present invention has the following advantages: by connecting a multi-layer embedded signal processing device to the equipment signal output end, the present invention transmits different types of equipment signals through a specific communication protocol, thereby avoiding the problem of unreliable transmission caused by attenuation and disturbance of equipment sending signal characteristics caused by factors such as long-line transmission and complex electromagnetic environment, and breaking through the difficulties of high / medium frequency signals being unable to be transmitted over long distances and having poor signal quality under the complex electromagnetic environment of the test site. At the same time, the present invention takes into account the processing of multiple characteristics and rate signals, solves the problem of remote equipment collection and observation, and provides detailed data for equipment development, troubleshooting and performance analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a principle block diagram of the present invention.

[0014] Figure 2 It is a schematic diagram of the parallel low-rate signal processing method of the present invention.

[0015] Figure 3 It is a schematic diagram of the high / low speed low level differential signal processing method of the present invention. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, the present invention provides an integrated long-distance transmission method for high / medium frequency digital signals of aviation equipment, comprising: connecting a multi-layer embedded signal processing device to the signal output end of the equipment, wherein the multi-layer embedded signal processing device comprises embedded software, a single-chip microcomputer and an FPGA connected to the single-chip microcomputer; When the equipment outputs parallel signals and high / medium frequency digital signals at the same time, the parallel signals output by the equipment are received through the first GPIO of the single-chip microcomputer, and the embedded software logically decodes the parallel signals according to the timing. After receiving the complete data frame, the signal modulation and encoding is performed according to the communication protocol 2, and the standard signal 1 corresponding to the communication protocol 2 is output to the remote test equipment; the standard signal 1 is a bus signal with strong anti-interference ability and suitable for long-distance transmission; The FPGA receives the high / low-speed low-level differential signal output by the equipment, decodes and frames it, and then passes the decoded and framed signal to the second GPIO of the microcontroller. The embedded software logically decodes the modulated signal according to the timing. After receiving the complete data frame, it modulates and frames the signal according to the communication protocol 3, and outputs the standard signal 2 corresponding to the communication protocol 3 to the remote test equipment; the standard signal 2 is a bus signal or Ethernet signal with strong anti-interference ability and suitable for long-distance transmission.

[0018] In the above scheme, the principle of the parallel low-rate signal processing method is as follows Figure 2In order to ensure the quality and reliability of low-rate parallel signal transmission, the reception buffer and signal modulation framing output of the equipment signal are controlled by designing the communication protocol and verification. Among them, the data frame reception communication protocol is communication protocol 1, and the single-chip microcomputer receives the parallel signal data frame output by the equipment according to communication protocol 1. The communication protocol 1 is as follows: a) Timing signal 1 = 0, timing signal 2 = 1, read the parallel signal address, and divide all equipment signal data into several packets; b) Timing signal 1 = 1, timing signal 2 = 0, read the parallel signal data and store it as the low data bit of the data; c) Timing signal 1 = 1, timing signal 2 = 1, read the parallel signal data and store it as the high data bit of the data.

[0019] The data output communication protocol is communication protocol 2, and the communication protocol 2 is specifically as follows: When the data states of the received equipment signal are X1, X2, X3 and X4 respectively, the received data is framed according to the data frame header, counter, data, and data accumulation, and then sent; X1 indicates that the data is 0 (invalid signal), X2 indicates the data size limit, X3 indicates the data low data bit, and X4 indicates the data high data bit.

[0020] The standard signal 1 is an RS422 bus signal.

[0021] like Figure 3 As shown, the high / low speed low level differential signal output by the equipment is decoded and framed by a high-speed FPGA; the high / low speed low level differential signal is level-converted, the signal of the equipment is obtained by FPGA, stored and cached according to the address and data, the validity of the data is determined by the check bit, and the signal modulation and framing output is controlled according to the communication protocol 3. The communication protocol 3 is as follows: a) Set the baud rate to 10MHz; b) completing data framing according to frame counter, data bit, data bit accumulation and data bit accumulation; c) Set the data sending period to 24ms.

[0022] The standard signal 2 is an RS485 bus signal.

[0023] The single chip microcomputer is an STM32 single chip microcomputer, and the embedded software is built in the STM32 single chip microcomputer.

[0024] Example: The simulation test of aviation equipment needs to process the high / medium frequency signals of the equipment, including parallel bus signals with a transmission rate of 10kbps~100kbps, and low-level differential bus signals with transmission rates of 50kbps~600kbps and 5Mbps~16Mbps respectively. Considering the timing relationship and complex electromagnetic interference environment in the signal transmission process, the technical solution of the present invention is adopted to set a multi-layer embedded signal processing device at the near end of the equipment to receive and modulate the various parallel / differential signals transmitted by the equipment, and modulate the signals into standard signals suitable for long-distance transmission and with strong anti-interference ability.

[0025] When equipment A is conducting a simulation test, the signal at the output end of the equipment is a medium frequency parallel bus signal. The multi-layer embedded signal processing device involved in the present invention receives the signal according to its receiving logic, decodes its logic, and then encodes it according to the communication protocol. After completion, it is transmitted over a long distance to the remote device receiving end through the standard interface 1.

[0026] When the B equipment is conducting a simulation test, the telemetry signal at the output end of the equipment is a multi-channel high / medium frequency low-level differential signal. The multi-layer embedded signal processing device converts the signal characteristics of the received multi-channel low-level differential signal, encodes the data according to the communication protocol, and transmits it over a long distance to the receiving end of the equipment through multiple standard interfaces 2.

[0027] Parts of the present invention not described in detail are prior art.

Claims

1. A method for integrated long-distance transmission of high / medium frequency digital signals of aviation equipment, characterized by: include: Connecting a multi-layer embedded signal processing device to the signal output end of the equipment, wherein the multi-layer embedded signal processing device includes embedded software, a single-chip microcomputer and an FPGA connected to the single-chip microcomputer; When the device outputs parallel signals and high / medium frequency digital signals at the same time, The parallel signal output by the equipment is received through the first GPIO of the single-chip microcomputer. The single-chip microcomputer receives the parallel signal output by the equipment according to the communication protocol 1. The embedded software performs logic decoding on the parallel signal according to the timing. After receiving the complete data frame, the signal is modulated and encoded according to the communication protocol 2, and the standard signal 1 corresponding to the communication protocol 2 is output from the standard interface 1 to the remote test equipment. The standard signal 1 is a bus signal with strong anti-interference ability and suitable for long-distance transmission. The FPGA receives the high / low-speed low-level differential signal output by the equipment, decodes and frames it, and then passes the decoded and framed signal to the second GPIO of the microcontroller. The embedded software logically decodes the modulated signal according to the timing. After receiving the complete data frame, it modulates and frames the signal according to the communication protocol 3, and outputs the standard signal 2 corresponding to the communication protocol 3 from the standard interface 2 to the remote test equipment; the standard signal 2 is a bus signal or Ethernet signal with strong anti-interference ability and suitable for long-distance transmission.

2. The method for integrated long-distance transmission of high / medium frequency digital signals of aviation equipment according to claim 1 is characterized by: The communication protocol 1 is specifically as follows: a) Timing signal 1 = 0, timing signal 2 = 1, read the parallel signal address, and divide all equipment signal data into several packets; b) Timing signal 1 = 1, timing signal 2 = 0, read the parallel signal data and store it as the low data bit of the data; c) Timing signal 1 = 1, timing signal 2 = 1, read the parallel signal data and store it as the high data bit of the data.

3. The method for integrated long-distance transmission of high / medium frequency digital signals of aviation equipment according to claim 1 is characterized by: The communication protocol 2 is specifically as follows: when the data states of the received equipment signal are X1, X2, X3 and X4 respectively, the received data is framed according to the data frame header, counter, data, and data accumulation, and then sent; X1 indicates that the data is 0, X2 indicates the data size limit, X3 indicates the low data bit of the data, and X4 indicates the high data bit of the data.

4. The method for integrated long-distance transmission of high / medium frequency digital signals of aviation equipment according to claim 1 is characterized by: The standard signal 1 is an RS422 bus signal.

5. The method for integrated long-distance transmission of high / medium frequency digital signals of aviation equipment according to claim 1 is characterized by: The communication protocol 3 is as follows: a) Set the baud rate to 10MHz; b) according to the frame counter, data bit, data bit accumulation and complete data framing; c) Set the data sending period to 24ms.

6. The method for integrated long-distance transmission of high / medium frequency digital signals of aviation equipment according to claim 1 is characterized by: The standard signal 2 is an RS485 bus signal.

7. The method for integrated long-distance transmission of high / medium frequency digital signals of aviation equipment according to claim 1 is characterized by: The single chip microcomputer is an STM32 single chip microcomputer.

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